Ted O'Brien on Tuesday cheers his win in the race for the state Senate's 55th District.

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Democratic County Legislator Ted O'Brien eked out a victory over Assemblyman Sean Hanna on Tuesday to represent the 55th District in the state Senate.

O'Brien, D-Irondequoit, won the seat with 52 percent of the vote to Hanna's 48 percent, a difference of 4,930 votes, according to unofficial results.

The race was one of a handful of tight Senate races across the state that could sway the majority party. Democrats lost their majority in the Senate in 2010, and hoped to gain it back on Tuesday. It was unclear late Tuesday what the makeup of the new Senate will be. ...